Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Oxidation of Metallic Nanoparticles

A. Auge[1], A. Weddemann[1], F. Wittbracht[1], B. Vogel[1], and A. Hütten[1]

[1]Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany

The oxidation behavior of metallic nanoparticles is investigated in respect to material parameters like Mott potential, defects on the microstructure and oxide volume increase per ionic defect. An emphasis is laid on magnetic nanoparticles where the degree of oxidation can be measured via the reduction of the magnetic moment.

Software Package for Modeling III-Nitride QW Laser Diodes and Light Emitting Devices

M. V. Kisin[1], R. G. W. Brown[1], and H. S. El-Ghoroury[1]
[1]Ostendo Technologies, Inc., Carlsbad, CA, USA

We present a modeling software package developed at Ostendo Technologies for analysis and design of semiconductor laser and light-emitting diodes. The current database of material parameters supports complete group of III-Nitride alloys used in visible spectrum applications and can be readily extended to all III-V compounds. Self-consistent multi-band quantum-mechanical model for carrier energy ...

Design and Development, via Prototype Testing and Multiphysics Modelling, of a Thermoelectric Generator (TEG) for Integration in Autonomous Gas Heaters

M. P. Codecasa[1], C. Fanciulli[1], R. Gaddi[2], F. Gomez Paz[3], and F. Passaretti[1]
[1]National Research Council of Italy - IENI Institute, Lecco, Italy
[2]Italkero S.r.l., Modena, Italy
[3]Studio di design Francisco Gomez Paz, Milano, Italy

An autonomous gas-heater for outdoor environments was selected as a test-case for cogeneration in gas-heaters and stoves, permitting installation and operation without need of an electrical network connection. A thermoelectric generator (TEG) was designed, converting part of produced heat into electrical power for auxiliaries (ventilation) or ancillary functions (illumination). Design approach, ...

Optimization of Extrusion Processes for non-Newtonian high-Viscous Fluids with Wall Slip and Shear Thinning Effects

W. Hoffmann[1], M. Scholz[1]
[1]SiCo-Solutions, Stuttgart, Germany

Simulation of the flow behaviour of non-Newtonian fluids with high viscosities leads to special material models with specific material parameters. In this presentation, a material model consisting of 4 material parameters describing the flow itself and also the wall slip is presented. The investigations of the flow behaviour are based on COMSOL Multiphysics® using the Modules CFD, Structural ...

Elucidating the Mechanism Governing Particle Alignment and Movement by DEP

G. Zhang [1], Y. Zhao [1], J. Brcka [2], J. Faguet [2],
[1] Clemson University, Clemson, SC, USA
[2] Tokyo Electron U.S. Holdings, Inc., Austin, TX, USA

We have simulated alignment and movement of multiple particles under Dielectrophoresis (DEP) using the Particle Tracing Module in COMSOL Multiphysics® software with particle-particle interaction taken into consideration. We are able to do efficient modeling for both 2D and 3D cases. With this work, we are able to shed important insights into the process of pearl chain formation, antenna-like ...

Modelagem da Perda de Umidade da Banana Durante o Processo de Secagem

J. P. Wojeicchowski [1], A. P. Ramos [2], J. S. Sousa [1], L. G. Maciel [1], M. M. Pariona [1],
[1] Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brasil
[2] Universidad Peruana Unión, Juliaca, Peru

O objetivo deste trabalho foi modelar a perda de umidade de bananas Caturra com os modelos empíricos e com o software COMSOL Multiphysics, definindo os coeficientes convectivo de transferência de massa e difusivo. O valor obtido para coeficiente de difusão, com base no ajuste matemático da 2ª Lei de Fick para cilindros foi de 1,89.10-9 m²/s. O valor do coeficiente convectivo de transferência de ...

Plasma Edge Simulations by Finite Elements using COMSOL

C. Hollenstein, and A. Howling
Ecole Polytechnique Fédérale de Lausanne, Switzerland

Finite elements using COMSOL Multiphysics have been used to simulate the edge plasma in a large area capacitively coupled RF reactor. In order to reduce numerical difficulties simplified reactor edge geometries have been used. First results show the importance of electrostatic double layers within this plasma. In addition the non-uniform behaviour of the plasma sheath around convex and ...

Modification of the Ion Angular Distribution in Plasma Sheath: Modeling Approach under COMSOL Multiphysic

J. Brcka
TEL US Holdings, Albany, NY, USA

System for in-situ control of the ion angular distribution function (IADF) in plasma reactor is modeled. Typical IADF depends on the pressure, bias and excitation frequency. It is formed due to a difference in the physical properties of the plasma and sheath domains. The IADF is modified by biased grid which is built into a holder. The time varying E-field in sheath is influencing the ion path. ...

SD Numerical Simulation Technique for Hydrodynamic Flow Gas-Solids Mixing

I. Mantilla[1], S. De Vicente[2]
[1]National University of Engineering, Lima, Perú
[2]Polytechnic University of Madrid, Madrid, Spain

We formulate a new mathematical model of gas-solids mixing hydrodynamic flow [1] in a combustion chamber with a fluid bed system used in the combustion of mineral coal waste. This model in study is called Model Gas-Solids Mixing and it is constructed by averaging the conservation equations (mass and momentum) for a two-phase flow, which takes into account the existence of a small parameter rho ...

Multiphysics Modelling of Sound Absorption in Rigid Porous Media Based on Periodic Representations of Their Microstructural Geometry

T.G. Zielinski[1]
[1]Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland

Sound absorption in porous materials with rigid frame and open porosity can be very effectively estimated by applying the Johnson-Allard model in order to substitute a porous medium with an equivalent effective fluid and then utilise the Helmholtz equation for time-harmonic acoustics. The model uses several parameters which characterize the micro-geometry of porous material from the macroscopic ...